[nova] Default to false for always_resize_on_same_host
[nova] Default to false for always_resize_on_same_host

We now have code in place that should be able to migrate VMs on resize.
Therefore, we don't have to force resizes to the same BB anymore. In
case we have to enable it again in a region, because it doesn't work
properly, it's now also configurable.

sapcc/helm-charts,sapcc/helm-charts,sapcc/helm-charts,sapcc/helm-charts